Symptom: This occurs when the playback head jumps from, for example, track A1 to A3,
instead of switching to track A2, during continuous play.
Cause: This is
usually caused either by (i) a failure of the pilot tone recognition circuit, or by (ii) the
introduction of a hum as a result of a defect elsewhere.
Remedy: Have the
fault repaired by an experienced, skilled engineer.